Merge branch 'issue106/surf-smooth' of github.com:fastalgorithms/chunkie into issue106/surf-smooth

Author: mrachh

chunkie/+chnk/+smoother/get_sigs.m

@@ -22,8 +22,8 @@
         dexpn = exp(-(dr.^2-dmin.^2)./(2*sig0^2));
         dsignum = sum(dsigj.*dexpn,2);
         dsigden = sum(dexpn,2);
-        dsignumx = -dsigj.*dexpn.*(dx./sig0^2);
-        dsignumy = -dsigj.*dexpn.*(dy./sig0^2);
+        dsignumx = -sum(dsigj.*dexpn.*(dx./sig0^2),2);
+        dsignumy = -sum(dsigj.*dexpn.*(dy./sig0^2),2);
         dsig = dsignum./dsigden;
         dsigx = dsignumx./dsigden;
         dsigy = dsignumy./dsigden;